Gravity modes are the best probes to study the solar radiative zone, in particular the nuclear core and to follow its potential variability with time and latitude. Nevertheless, their amplitude is small and the solar noise particularly high in the range of frequency where they stand (below 500 μ Hz). It is why they are looked for more than 20 years

Not Available

Using the results of optical identification of the diffuse X-ray sources in both CDFS and LH fields, we have compiled a catalog of objects containing over 10 groups and clusters of galaxies with redshift larger than 0.6. We present the properties of this sample.

Not Available

Not Available

Although the Sloan Digital Sky Survey (SDSS) was primarily envisioned as a tool for understanding the nature of the `high redshift' universe, significant discoveries have already been made at lower redshift, z~0, through studies of stars in the Milky Way galaxy. We have begun to explore the nature of the Milky Way by detailed investigation of the